玉
玉石由两个主要品种组成:软玉和硬玉。软玉由硅酸钙镁制成,通常呈绿色或乳白色。硬玉颜色较丰富,如绿色、淡紫色、红色和白色,是一种硅酸铝钠。这两种形式都是在高压和低温条件下形成的变质岩。从地理分布来看,软玉主要产于中国、新西兰和加拿大,而硬玉主要产自缅甸。
1-3产品,共3产品
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